<?php

/**
 * This is the model class for table "tokens".
 *
 * The followings are the available columns in table 'tokens':
 * @property integer $id
 * @property integer $user_id
 * @property string $action
 * @property string $value
 * @property string $created_on
 */
class Token extends CActiveRecord
{
	/**
	 * Returns the static model of the specified AR class.
	 * @param string $className active record class name.
	 * @return Tokens the static model class
	 */
	public static function model($className=__CLASS__)
	{
		return parent::model($className);
	}

    /**
     * Set token value before save
     */
    protected function beforeSave()
    {
        $this->deletePreviousTokens();
        $this->value=substr(md5(rand()),0,20);
        return parent::beforeSave();
    }

	/**
	 * @return string the associated database table name
	 */
	public function tableName()
	{
		return 'tokens';
	}

	/**
	 * @return array validation rules for model attributes.
	 */
	public function rules()
	{
		// NOTE: you should only define rules for those attributes that
		// will receive user inputs.
		return array(
			array('user_id', 'numerical', 'integerOnly'=>true),
			array('action', 'length', 'max'=>30),
			array('value', 'length', 'max'=>40),
			// The following rule is used by search().
			// Please remove those attributes that should not be searched.
			array('action, value, created_on', 'safe', 'on'=>'search'),
		);
	}

	/**
	 * @return array relational rules.
	 */
	public function relations()
	{
		// NOTE: you may need to adjust the relation name and the related
		// class name for the relations automatically generated below.
		return array(
		);
	}

	/**
	 * @return array customized attribute labels (name=>label)
	 */
	public function attributeLabels()
	{
		return array(
			'id' => 'ID',
			'user_id' => 'User',
			'action' => 'Action',
			'value' => 'Value',
			'created_on' => 'Created On',
		);
	}

	/**
	 * Retrieves a list of models based on the current search/filter conditions.
	 * @return CActiveDataProvider the data provider that can return the models based on the search/filter conditions.
	 */
	public function search()
	{
		// Warning: Please modify the following code to remove attributes that
		// should not be searched.

		$criteria=new CDbCriteria;

		$criteria->compare('action',$this->action,true);
		$criteria->compare('value',$this->value,true);
		$criteria->compare('created_on',$this->created_on,true);

		return new CActiveDataProvider($this, array(
			'criteria'=>$criteria,
		));
	}
    
    /**
     * Remove obsolete tokens for the same user and action
     */
    private function deletePreviousTokens()
    {
        $this->deleteAllByAttributes(array('user_id'=>$this->user_id,'action'=>$this->action));
    }
}